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Re: [Qemu-devel] [PATCH] 3DNow! instruction set emulation

From: Michael Tross
Subject: Re: [Qemu-devel] [PATCH] 3DNow! instruction set emulation
Date: Mon, 17 Mar 2008 04:42:36 -0700 (PDT)

Joachim Henke-5 wrote:
> The attached patch adds the 3DNow! and extented 3DNow! instruction  
> sets to qemu. I wrote this just according to the manuals from AMD,  
> since I don't have an AMD processor for testing (which was actually  
> my motivation to create this patch).
> Please note that (like with the SSE emulation) the rounding for the  
> floating point operations isn't exact in every case. But the  
> precision should be sufficient for typical applications.
> The CPUID is also extented by the bit for extented MMX, which is a  
> subset of SSE and already implemented in qemu.

Rediffed the patch to apply to the current 0.9.1 release.

Additionally I've added a cpu definition that makes use of the 3dnow! flag.

With this patch I am able to load and run recent linux kernels compiled for
for the K7 32-bit architecture. Newer kernels test the cpu feature flags and
thus require certain feature flags to be present on the target cpu [1]. But
I didn't do further testing on the emulated instructions itself so far.


[1] http://kerneltrap.org/node/11754

http://www.nabble.com/file/p16092150/3dnow.patch.gz 3dnow.patch.gz 
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